Hand grip strengthener



FIG. 1 is a front elevation view of a HAND GRIP STRENGTHENER, the rear elevation view being the same, showing our new design;

FIG. 2 is a side elevation view thereof, the opposite side elevation view being the same;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a perspective view thereof. 

CLAIM The ornamental design for a HAND GRIP STRENGTHENER as shown and described. 